用JButton创建的ImageIcon仅在调整窗口大小后出现

Question

我正在写一个带有占位符资产的角色创建者迷你游戏。它应该是具有六个按钮的GUI，其中三个按钮可以改变简笔画的头发，衣服和鞋子，另外三个按钮可以将其删除。

我尝试将setVisible（true）添加为headBUTTON_ActionPerformed（）的最后一行，但它没有改变。图片的位置很好，因为它们出现了，但不是立即显示。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;

public class GUI extends JFrame {  

    private Avatar pc = new Avatar();


    private JLabel flavortext = new JLabel();
    private JButton headBUTTON = new JButton();

    private JLabel base = new JLabel();

    BufferedImage baseImage;

  public GUI(){

    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    int frameWidth = 755;
    int frameHeight = 618;
    setSize(frameWidth, frameHeight);
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    int x = (d.width - getSize().width) / 2;
    int y = (d.height - getSize().height) / 2;
    setLocation(x, y);
    setTitle("CREATOR");
    //setResizable(false);

    try {
      setContentPane(new JLabel(new ImageIcon(ImageIO.read(new File("assets/bg.png")))));
    } catch (IOException e) {
      e.printStackTrace();
    }


    headBUTTON.setBounds(24, 160, 113, 41);
    headBUTTON.setText("change Head");
    headBUTTON.setMargin(new Insets(2, 2, 2, 2));
    headBUTTON.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent evt) {
    headBUTTON_ActionPerformed(evt);
    }
    });
    add(headBUTTON);

    try {
      baseImage = ImageIO.read(new File("assets/base.png"));
      base.setIcon(new ImageIcon(baseImage));
    } catch(Exception e) {
      e.printStackTrace();
    }

    base.setBounds(210, 128, 371, 449);
    add(base);

    setVisible(true);
  } // end of public GUI



  public static void main(String[] args) {
    new GUI();
  } 

  public void headBUTTON_ActionPerformed(ActionEvent evt) {
    pc.changeHead();
    JLabel headd = new JLabel();
    headd.setIcon(new ImageIcon(pc.getHead()));
    headd.setBounds(210, 128, 371, 449);
    add(headd);
    setVisible(true);
  }
}


This is the Avatar class:




 public class Avatar{
      private String gender;
      private BufferedImage head;
      private BufferedImage body;
      private BufferedImage bottom;

      public int countH, countBot, countBod;

      Avatar(){
        countH = 1;
        countBod = 1;
        countBot = 1;
      }

      public BufferedImage getHead(){
         return head;
        }

        public BufferedImage getBody(){
         return body;
        }

      public BufferedImage getBottom(){
        return bottom;
        }

      public void changeHead(){
        try {
          if (countH > 2) {
            countH = 1;
          }

          head  = ImageIO.read(new File("assets/hair"+countH+".png"));
          countH++;
        } catch(Exception e) {

        } 
      }

      public void changeBody(){
        try {
          if (countBod > 2) {
            countBod = 1;
          }

          body  = ImageIO.read(new File("assets/body"+countBod+".png"));
          countBod++;
        } catch(Exception e) {

        } 
      }

      public void changeBottom(){
        try {
          if (countBot > 2) {
            countBot = 1;
          }

          bottom  = ImageIO.read(new File("assets/bottom"+countBot+".png"));
          countBot++;
        } catch(Exception e) {

        }
      }
    }

基本图像和背景图像正确显示，但是单击按钮时，我必须调整窗口大小以使“头发”出现。目前，我只尝试使“ Head”按钮起作用。